Osg 1405002708 Thread Forming Tap 5-40 Unc Bottoming

Product Description

The OSG 1405002708 is a thread forming tap in the EXOTAP VP-NRT series, designed for cold-forming internal threads in blind holes without cutting or producing chips. Sized for 5-40 UNC threads, it features a bottoming chamfer with 1 to 1.5 chamfered threads, allowing threading close to the bottom of a blind hole. Manufactured from powdered metal high-speed steel and finished with a TiCN (Titanium Carbonitride) coating, the tap delivers enhanced wear resistance and lubricity across a wide range of work materials. The H4 thread limit ensures consistent tolerance control. This tap is installed by machinists, tool and die makers, and precision manufacturing technicians.

The 1405002708 is suited for blind hole threading operations in materials including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. Its cold-forming action displaces material rather than cutting it, producing stronger threads with improved surface finish. This makes it a practical choice for production threading in CNC machining centers, drill presses, and tapping machines where chip evacuation in deep blind holes is a concern.

Key Features

• Bottoming chamfer (1 to 1.5 chamfered threads) for threading close to blind hole bottom
• Powdered metal high-speed steel construction for improved toughness and wear resistance
• TiCN coating extends tool life and reduces friction across varied work materials
• H4 thread limit for consistent tolerance control on 5-40 UNC threads
• No coolant-through requirement simplifies setup on standard tapping equipment
• Right-hand thread direction, compatible with standard tapping attachments

Compatibility

Designed for blind hole thread forming in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces requiring 5-40 UNC internal threads.

Installation Notes

Thread forming taps require a properly sized forming tap drill hole, which differs from standard cut tap drill sizes - consult a forming tap drill chart before drilling. Secure the workpiece and use appropriate tapping fluid or cutting oil recommended for the work material. Power down or de-energize the machine before changing tooling. Follow shop-standard speeds and feeds for thread forming taps, as cold-forming generates higher torque than cutting taps of the same size.